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APIs Interview Questions

Prepare for technical discussions with these common APIs interview questions and expert answers.

Q1: What is the primary execution model of APIs?

Answer: APIs is designed to execute instructions conceptually as a scripting language.

Q2: Explain the significance of REST HTTP Protocol & Request Forms.

Answer: This represents a foundation for structural bindings, scope, and lifecycle configurations.

Q3: What is the difference between synchronous and asynchronous processes in APIs?

Answer: Synchronous calls block the execution flow until complete, while asynchronous calls return promises or execution context immediately and run concurrently.

Q4: How is memory managed inside APIs?

Answer: Memory management depends on the compiler/runtime, ranging from raw pointers (C/C++), automatic reference/ownership compilation rules (Rust), garbage collection (Go, Python, Java, JavaScript), or SQL engines.

Q5: How do you optimize execution in APIs?

Answer: Use efficient algorithms, minimize memory re-allocations, release connections, and follow: "Structure API responses uniformly, output correct semantic HTTP status code elements, rate-limit routes and protect secrets."